US20070286253A1 - Coreless furnace coil clamp - Google Patents
Coreless furnace coil clamp Download PDFInfo
- Publication number
- US20070286253A1 US20070286253A1 US11/448,698 US44869806A US2007286253A1 US 20070286253 A1 US20070286253 A1 US 20070286253A1 US 44869806 A US44869806 A US 44869806A US 2007286253 A1 US2007286253 A1 US 2007286253A1
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- United States
- Prior art keywords
- induction coil
- lever
- leg
- frame
- crucible
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/22—Furnaces without an endless core
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/08—Details peculiar to crucible or pot furnaces
- F27B14/10—Crucibles
Definitions
- a typical problem faced by designers of coreless furnaces is how to secure the power and cooling coils of the coreless furnace. It is well known that vibration must be controlled when designing the assembly of a coreless furnace coil. If not, mechanical and electromotive forces causing heavy vibrations can lead to premature failure of the coreless furnace coil. By way of example, forces on a single coil of a coreless furnace often reach 2,500 pounds and can sometimes be as large as 5,000 pounds.
- FIG. 1 is a cross-sectional elevation view of an induction furnace having an induction coil assembly against which forces are applied by a plurality of clamp assemblies and a plurality of intermediate yoke assemblies.
- the rod 92 can be received through apertures 100 , 102 defined in the walls 40 a, 40 b of the support.
- Annular bearings 104 , 106 can be positioned radially about the rod 92 to provide a sliding but guided fit between the rod 92 and the walls 40 a, 40 b.
- the compression spring 110 acts against the fixedly provided column wall 40 b and the nuts 108 so as to urge the rod 92 and thereby the lever lower leg 90 a in a radially outward direction relative to the axis 80 (i.e., to the left in FIG. 4 ).
- each clamping assembly 46 applies an input load to the clamping assembly's lower lever leg 90 a which, due to the pivotal mounting of the lever 90 , causes the upper lever leg 90 b to induce a leveraged constant positive downward loading or force onto the top or upper end of the induction coil 14 .
- a much larger force can be exerted to clamp the induction coil 14 which advantageously maintains the coil in compression at all times (i.e., the compression force on the induction coil 14 does not go negative or to tension, or even to zero). This has been found to greatly reduce fatigue in the components of the furnace 10 .
- a lower end of the induction coil 14 is captured (i.e., axially fixed) and mechanically supported by the plate 18 , which has the effect of eliminating or at least substantially reducing the likelihood of crucible deformation.
- the induction coil 14 is pressed against the bottom of the furnace, i.e., the lower frame portion 22 , which is a welded integral part of the frame 16 , to retain the coil 14 in a fixed position with respect to the crucible lining 12 f, the frame 16 and the upper furnace structure. This removes the need for constant torque adjustments to be made with respect to the plurality of clamp assemblies provided for applying a constant force on the induction coil 14 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
Description
- The present disclosure generally relates to coreless induction furnaces and relates more particularly to an improved mounting or loading arrangement for an induction coil in a coreless induction furnace. In one embodiment, the coreless induction furnace includes a crucible, an induction coil wound about the crucible, a frame supporting the crucible and the induction coil, and an improved induction coil loading arrangement including at least one clamping assembly for providing a leveraged axial force to an upper side of the induction coil. The improved induction coil loading arrangement will be described with particular reference to this embodiment, but it is to be appreciated that it is also amenable to like applications.
- A typical problem faced by designers of coreless furnaces is how to secure the power and cooling coils of the coreless furnace. It is well known that vibration must be controlled when designing the assembly of a coreless furnace coil. If not, mechanical and electromotive forces causing heavy vibrations can lead to premature failure of the coreless furnace coil. By way of example, forces on a single coil of a coreless furnace often reach 2,500 pounds and can sometimes be as large as 5,000 pounds.
- One electromagnetic force encountered in coreless furnaces is a compressive force on the coreless furnace's coil that goes to a maximum and returns to zero on each electrical cycle. A typical furnace operating at 300 Hz would have over 1,000,000 cycles per hour or about 12,000,000 cycles if operated for about one half day. For typical fatigue applications, 10-20 million cycles is considered large and, in the case of a conventional coreless furnace, would be met in a day or so of operation.
- A common method of reducing fatigue on a member is to retain the member, or the coil in a case of a coreless furnace, at a level so that it does not change state, i.e., a stress going from negative (i.e., compression) to positive (i.e., tension) and to minimize the variation of that stress. For a coreless furnace coil, a force is applied axially to the coil of sufficient magnitude such that the stress on the coil does not return to “zero” and thus the coil is always maintained in compression. Prior art coreless furnace designs applied force directly to the coil utilizing shunts which, generally, are not rigid and are only retained radially to the frame (i.e., not axially). In some limited coreless furnace designs, the coil is retained axially, i.e., from the top and the bottom, but it is generally still free to move relative to the furnace's refractory or the furnace proper.
- One conventional means of clamping the coreless furnace's coil was by applying a constant upward force on the power and cooling coils. The clamp applying such a force included a spring-loaded lever mounted near a floor of the furnace for providing a constant upward positive force on the coil. While this conventional means does initially provide the desired positive force on the coil, it is subsequently compromised when the furnace's refractory, which is located above the top of the coil, begins to lift and warp due to the heat and vibration that occurs during operation of the furnace. As a result, operators soon find that they constantly must adjust the set-up torque of the clamp. This can lead to a further problem. That is, when adjusting the set-up torque, over adjustment (e.g., applying too great of a torque during adjustment) can cause lifting of the upper furnace refractory resulting in an impossible condition where the correct positive clamping force cannot be achieved. Due to the afore-mentioned drawbacks, the power level of the coreless furnace had to be limited (e.g., to under 8 MW) to keep furnace from self-destructing.
- According to one aspect, a coreless induction furnace is provided. More particularly, in accordance with this aspect, the coreless induction furnace includes a crucible for holding a material to be heated. An induction coil is wound about the crucible. A frame supporting the crucible and the induction coil is wound about the crucible. An induction coil loading arrangement includes at least one clamping assembly for providing a leveraged axial force to an upper side of the induction coil.
- According to another aspect, an induction coil loading arrangement is provided for a coreless induction furnace having a crucible and an induction coil wound about the crucible. More particularly, in accordance with this aspect, the loading arrangement includes a frame for supporting the crucible and the induction coil. At least one clamping assembly is connected to the frame for applying an axial force onto the induction coil. The at least one clamping assembly includes a lever pivotally secured to the frame. The lever has a first portion connected to the frame so as to be urged in a direction radially away from the induction coil and a second portion extending toward the induction coil for applying the axial force onto the induction coil.
- According to yet another aspect, a coreless induction furnace having an induction coil loading arrangement is provided. More particularly, in accordance with this aspect, the coreless induction furnace having an induction coil loading arrangement includes a crucible for holding a material to be heated. An induction coil is wound about the crucible. A frame supporting the crucible and the induction coil is wound about the crucible. A plurality of planting assemblies provides a leveraged axial force to an upper side of the induction coil. Each of the plurality of clamping assemblies has a lever in a pivotal connection between the lever and the frame. The lever has a first leg extending downward relative to the pivotal connection in a second leg extending toward an upper axial end of induction coil. The pivotal connection allows a force applied to the lever first leg to be leveraged and applied to the upper axial end of the induction coil.
-
FIG. 1 is a cross-sectional elevation view of an induction furnace having an induction coil assembly against which forces are applied by a plurality of clamp assemblies and a plurality of intermediate yoke assemblies. -
FIG. 2 is a cross-sectional plan view of the induction furnace taken along the line 2-2 ofFIG. 1 further showing the clamp assemblies and intermediate yoke assemblies. -
FIG. 3 is an enlarged partial cross-sectional elevation view of a selected one of the clamp assemblies ofFIG. 1 shown applying a downward force on the induction coil assembly. -
FIG. 4 is an enlarged partial cross-sectional elevation view of the clamp assembly ofFIG. 3 showing a lever of the clamp assembly being urged toward an adjacent vertical frame member of the induction furnace. -
FIG. 5 is an enlarged partial cross-sectional plan view of a selected one of the intermediate yoke assemblies and clamp assemblies ofFIG. 2 . -
FIG. 6 is an enlarged partial cross-sectional plan view taken along the line 6-6 ofFIG. 3 showing a lever of the clamp assembly ofFIG. 5 pivotally mounted to the adjacent vertical frame member. - Referring now the drawings wherein the showings are for the purposes of showing one or more exemplary embodiments only and not for limiting the scope of the appended claims,
FIG. 1 shows a coreless induction furnace generally designated byreference numeral 10. In the illustrated embodiment, thefurnace 10 generally includes acrucible 12 formed of a refractory material for holding a material to be heated, aninduction coil assembly 14 wound or coiled about the crucible and aframe 16, such as a steel frame, for supporting thecrucible 12 and thecoil assembly 14. As will be described in more detail below, thefurnace 10 further includes an induction coil loading arrangement including at least one clamping assembly for providing a leveraged axial force to an upper side of theinduction coil 14. If desirable, thecrucible 12 can include aspout portion 12 a and amonolithic liner 12 f, such as a monolithic liner formed of a refractory material and fired in place. - The
frame 16, also referred to herein as the furnace body, can include aframe plate 18, which can be a heavy structural steel plate, upon which abottom portion 12 b of thecrucible 12 can rest and be supported. Theframe 16 can further include anannular flange portion 20 connected to theframe plate 18 by aframe bottom portion 22. Alternatively, thebottom portion 22 can be considered to include theframe plate 18 and/or theflange portion 20. Atilting support 24 defining arecess 26 is disposed within asleeve 28 of theframe bottom portion 22 and immediately below theframe plate 18. Asupport 30 can also be disposed within thesleeve 28 for snuggly holding thetilting support 24 in position. Theframe 16, and specifically theframe bottom portion 22, holds aheat insulating member 32 annularly about thecrucible base portion 12 b. More particularly, theheat insulating member 32 resides between thesleeve 28 andwall 34 of theframe bottom portion 22. In one embodiment, theheat insulating member 32 can be pre-cast prior to installation on theframe 16. - As shown, a plurality of
vertical frame members 40, also referred to herein as support columns or supports, extends upward from theframe flange portion 20 to asupport plate 42, which can be a heavy structural steel plate, upon which atop flange portion 12 c of the crucible rests and/or is supported. Askirt 44 can depend downwardly from aperipheral edge 42 a of thesupport plate 42 and radially outside thesupports 40 to limit radially movement of theplate 42 with respect to thesupports 40. As will be described in more detail below, a plurality ofclamping assemblies 46 andintermediate yoke assemblies 48 can be mounted to and supported by thesupports 40, which themselves can be considered as included by theframe 16. - The
crucible 12, which can alternately be referred to as a refractory, is radially surrounded by theinduction coil 14, which is comprised of a plurality of windings. More particularly, an active current-receiving coil orcoil portion 14 a is helically wound to radially surround acylindrical wall portion 12 d of thecrucible 12 and is axially flanked by cooling coils orcoil portions crucible 12 and are usually not provided with current. Theinduction coil 14 can be radially separated or spaced from the crucible bylayer 52, such as a layer of mica.Intermediate yokes 56 of theintermediate yoke assemblies 48 can similarly be radially separated or spaced from theinduction coil 14 by alayer 58, such as a layer of grout material. As illustrated,grout material 60, which can be integrally provided with thelayer 58, can also be used to axially insulate between thecoil portions coil portion - As shown in the illustrated embodiment, insulating
rings induction coil 14. The lower insulatingring 62 separates theinduction coil 14 from a lowerannular support 66, which is received within agroove 68 defined in the insulatingmember 32, that can be a heavy structural ring that resists any forces or movements imported from theinduction coil assembly 14. Wedged between thelower support 66, the insulatingmember 32, the layer 52 (separating thecrucible sleeve portion 12 d from the induction coil 14), and thecrucible 12 is an insulatingmember 70, which can be formed of a pre-cast grouting material into the illustrated wedge shape. An upper insulatingmember 72 is disposed annularly about thecrucible 12 adjacent thesupport plate 42. The upper insulatingmember 72 is held in the illustrated position byframe members frame 16. As shown, the upper insulatingmember 72 and theframe members crucible spout 12 a. A suitable angle member or members 78 (FIG. 3 ) can be used to securesupport member 76 tovertical support member 74. If desired, thecrucible 12 can include asuitable cap 12 e for retaining materials placed within the crucible. - With additional reference to
FIG. 2 , the plurality ofsupport columns 40 are circumferentially or angularly spaced about a central axis 80 (and apart relative to one another) and spaced radially outwardly relative to thecrucible 12 and theinduction coil 14. In the illustrated embodiment, six (6)such support columns 40 are provided, each with aclamp assembly 46 and several pairs ofintermediate yoke assemblies 48 vertically spaced therealong. For example, each illustratedcolumn 40 includes one (1)clamp assembly 46 and four (4) pairs of vertically spaced intermediate yoke assemblies 48 (with each pair flanking its corresponding column). As shown, eachcolumn 40 can be generally hollow and include aninner wall 40 a, anouter wall 40 b and spacedside walls - With still additional reference to
FIG. 3 , the illustrated clampingassembly 46, which can be the same as and therefore representative of the remainingclamp assemblies 46, includes alever 90 pivotally mounted to itsadjacent support column 40. In particular, thelever 90 has a lower portion orleg 90 a movably connected to thesupport column 40 so as to be urged toward the support column, a pivotally connected mountingportion 90 b, and an upper portion orleg 90 c for applying a downward force on the induction coil 14 (i.e., the side adjacent an open end of the crucible 12). Thelower lever leg 90 a extends along a longitudinal length of theadjacent support column 40 and theupper lever leg 90 c extends from the pivotal connection between thelever 90 and thesupport column 40 toward the induction coil. The mounting of thelever 90 to thecolumn 40 is such that the lever is able to apply-a constant positive loading on an upper axial side of theinduction coil 14. Aforce applying member 88 can be mounted to distal end of thelever leg 90 c (i.e., end ofleg 90 c distal relative to mountingportion 90 b) for purposes of supplying greater contact area between thelever 90 and the insulatingring 64, which is immediately adjacent theinduction coil 14. This has the effect of angularly or circumferentially spreading the loading applied by theclamp assemblies 46. - With further reference to
FIG. 4 , in the illustrated embodiment, thelever 90 is mounted in urging relation relative to the adjacenthollow support 40 by a spring-urged rod orshaft 92. Therod 92, which extends in a direction approximately normal relative to theadjacent support column 40 and the leverlower leg 90 a, has a first threadedend 92 a received through anaperture 94 defined in thelever leg 90 a, also referred to herein as a lever first leg. Threaded members 96 (such as the illustrated nuts) can be used to secure therod 92 to thelever 90. As illustrated, nuts 96 can be provided in pairs on either side of thelever 90, optionally with the illustratedwashers 98. As shown, therod 92 can be received throughapertures walls Annular bearings rod 92 to provide a sliding but guided fit between therod 92 and thewalls - Additional threaded members 108 (such as the nuts illustrated), can be threadedly secured on an opposite or second threaded
end 92 b of the rod. Likenuts 96,nuts 108 can be provided in pairs so as to be disposed in locking relation. To provide the urging force on the leverlower leg 90 a, acompression spring 110 is annularly disposed about therod 92 between the nuts 108 and theouter wall 40 b. In one embodiment, thecompression spring 110 can exert a spring force of about 750 pounds, which is applied to thelower lever leg 90 a. Optionally,washers 112 can be provided about therod 92 so as to axially flank thespring 110. Thecompression spring 110 acts against the fixedly providedcolumn wall 40 b and thenuts 108 so as to urge therod 92 and thereby the leverlower leg 90 a in a radially outward direction relative to the axis 80 (i.e., to the left inFIG. 4 ). - With reference now to
FIGS. 5 and 6 , a pair of spaced apart mountingarms column wall 40 a in the illustrated embodiment. A pivot pin orpintle 122 extends throughapertures arms aperture 128 defined in thelever mounting portion 90 b, so as to pivotally mount thelever 90 to thecolumn 40 and create a fulcrum at axis 130 (i.e., the pivotal connection). Lock or retainingpins 132 can be installedadjacent ends 122 a, 22 b of thepin 122 to limit axial displacement of thepin 122 relative to thearms washers 134 can be disposed between each of the mountingarms lever 90. As a result of the spring-loadedrod 92 applying a force on thelower lever leg 90 a and the pivotal mounting of thelever 90 to thearms adjacent support column 40, leveraged force is applied by theupper lever leg 90 c and theforce applying member 88 secured thereto in a downward direction to the induction coil 14 (through insulating ring 64). In one embodiment, the spring-loadedrod 92 applies a 750 pound spring force to thelower lever leg 90 a, which is leveraged to 1,300 pounds applied to theinduction coil 14 by theupper lever leg 90 c and theforce applying member 88. - Mounting
arm support structures 140, which includebase wall 140 a and spaced apart angularly disposedwalls respective side walls support column 40. In the illustrated embodiment, eachsupport structure 140 is secured to arespective side wall bolt 142, and a mountingplate 144 is provided between thebase wall 140 a and therespective side wall intermediate yoke assembly 48, which can include the mountingarm support structure 140, includes a correspondingintermediate yoke 56 secured to an adjacent mountingarm structure 140 so as to urge theyoke 56 radially inwardly into theinduction coil 14 and toward thecrucible 12. - More particularly, each
yoke assembly 48 includes a threaded rod or bolt 146 received through alignedapertures walls structure 140. A distal bolt end 146 a (opposite bolt head 146 b) is received in a support structure orshoe 152, which can be fixedly secured, such as by welding, to intermediateyoke base plate 154.Angle members base plate 154 to as to capture theintermediate yoke 56 against the induction coil 14 (though theyoke 56 is spaced from theinduction coil 14 by the layer 58). With brief reference toFIG. 1 , theangle members yokes 56 therebetween. Returning toFIGS. 5 and 6 , a threadedmember 160, such as a nut, is threadedly received on a threadedportion 146 c of thebolt 146 and positioned between thewalls Compression spring 162 is disposed between thenut 160 and thewall 140 b so as to urge thebolt 146 radially inwardly and thereby urge theyoke 56 radially toward theinduction coil 14. As is known, each of theintermediate yokes 56 can be formed of stacked plates and can serve as a radial support for theinduction coil 14 and also for magnetic field force guiding. - In the illustrated embodiment, a clamping
assembly 46 is provided with each of the six (6) support columns such that there are a total of six (6) clampingassemblies 46. In one embodiment, each clampingassembly 46 can exert about 1,300 pounds of downward directed force to theinduction coil 14 and where six (6) clampingassemblies 46 are used a total of 7,800 pounds of downward force can be applied to theinduction coil 14, having the effect of firmly retaining theinduction coil 14 and increasing the life of theinduction coil 14,crucible 12 and other components of the furnace 10 (e.g., theliner 12 f and layers 58,60). Of course, the number ofclamping assemblies 46 can vary, as can the number of support columns 40 (and a clamping assembly need not be provided on every provided support column). For example, theinduction furnace 10 can include eight (8)support columns 40 and six (6) or eight (8) clampingassemblies 46 could be distributed about the eight (8)support columns 40. In any case, unlike conventional methods of applying a clamping load to a lower end of an induction coil, theclamping assemblies 46 of the illustrated embodiment apply a clamping load on an upper end of theinduction coil 14, which eliminates the disadvantage of prior art clamping assemblies tending to lift the crucible up and out of the furnace in which it was employed. - The spring-loaded
rod 92 of each clampingassembly 46 applies an input load to the clamping assembly'slower lever leg 90 a which, due to the pivotal mounting of thelever 90, causes theupper lever leg 90 b to induce a leveraged constant positive downward loading or force onto the top or upper end of theinduction coil 14. Thus, a much larger force can be exerted to clamp theinduction coil 14 which advantageously maintains the coil in compression at all times (i.e., the compression force on theinduction coil 14 does not go negative or to tension, or even to zero). This has been found to greatly reduce fatigue in the components of thefurnace 10. - As illustrated, a lower end of the
induction coil 14 is captured (i.e., axially fixed) and mechanically supported by theplate 18, which has the effect of eliminating or at least substantially reducing the likelihood of crucible deformation. Stated alternatively, theinduction coil 14 is pressed against the bottom of the furnace, i.e., thelower frame portion 22, which is a welded integral part of theframe 16, to retain thecoil 14 in a fixed position with respect to the crucible lining 12 f, theframe 16 and the upper furnace structure. This removes the need for constant torque adjustments to be made with respect to the plurality of clamp assemblies provided for applying a constant force on theinduction coil 14. Additionally, by maintaining a constant positive force on theinduction coil 14, the life of the mechanical components of thefurnace 10 are significantly extended. Still further advantages of the presently disclosed clamping arrangement include allowing thefurnace 10 to run at higher power levels (for example 10-11 MW) with reduced likelihood of mechanical failure at such higher power levels and quieter operation of thefurnace 10. - It will be appreciated that various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Also that various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
Claims (20)
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US11/448,698 US7606286B2 (en) | 2006-06-07 | 2006-06-07 | Coreless furnace coil clamp |
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US11/448,698 US7606286B2 (en) | 2006-06-07 | 2006-06-07 | Coreless furnace coil clamp |
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US20070286253A1 true US20070286253A1 (en) | 2007-12-13 |
US7606286B2 US7606286B2 (en) | 2009-10-20 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102628649A (en) * | 2012-05-04 | 2012-08-08 | 苏州罗卡节能科技有限公司 | Medium frequency induction furnace |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2852587A (en) * | 1955-11-07 | 1958-09-16 | Ajax Engineering Corp | Induction furnace |
US3303258A (en) * | 1963-06-20 | 1967-02-07 | Junker Otto | Vacuum induction furnace |
US4622679A (en) * | 1984-02-14 | 1986-11-11 | Otto Junker Gmbh | Coreless induction furnace |
US5272720A (en) * | 1990-01-31 | 1993-12-21 | Inductotherm Corp. | Induction heating apparatus and method |
US5416794A (en) * | 1990-01-31 | 1995-05-16 | Inductotherm Corp. | Induction furnace havng a modular induction coil assembly |
US5425048A (en) * | 1990-01-31 | 1995-06-13 | Inductotherm Corp. | Heating apparatus for induction ladle and vacuum furnaces |
-
2006
- 2006-06-07 US US11/448,698 patent/US7606286B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2852587A (en) * | 1955-11-07 | 1958-09-16 | Ajax Engineering Corp | Induction furnace |
US3303258A (en) * | 1963-06-20 | 1967-02-07 | Junker Otto | Vacuum induction furnace |
US4622679A (en) * | 1984-02-14 | 1986-11-11 | Otto Junker Gmbh | Coreless induction furnace |
US5272720A (en) * | 1990-01-31 | 1993-12-21 | Inductotherm Corp. | Induction heating apparatus and method |
US5416794A (en) * | 1990-01-31 | 1995-05-16 | Inductotherm Corp. | Induction furnace havng a modular induction coil assembly |
US5425048A (en) * | 1990-01-31 | 1995-06-13 | Inductotherm Corp. | Heating apparatus for induction ladle and vacuum furnaces |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102628649A (en) * | 2012-05-04 | 2012-08-08 | 苏州罗卡节能科技有限公司 | Medium frequency induction furnace |
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